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fix(highlight): replace hardcoded theme-specific color fallbacks

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Problem: fallback hex values for `Normal.bg`, `DiffAdd.bg`, etc. in
`compute_highlight_groups` were hardcoded to catppuccin mocha colors
(`0x1e1e2e`, `0x2e4a3a`, `0x4a2e3a`, etc.), producing visibly wrong
highlight groups for users on any other colorscheme when `Normal` has
no background (transparent terminals or early startup).

Solution: replace all hardcoded fallbacks with `vim.o.background`-aware
neutral values — dark mode gets near-black/grey, light mode gets
near-white/dark-grey — so the fallback path is theme-agnostic.
This commit is contained in:
Barrett Ruth 2026-03-05 19:37:33 -05:00
parent e7d56e3bbe
commit 904f141366
Signed by: barrett
GPG key ID: A6C96C9349D2FC81
1 changed files with 7 additions and 6 deletions
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13
lua/diffs/init.lua
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@ -470,11 +470,12 @@ local function compute_highlight_groups()
local diff_added = resolve_hl('diffAdded')
local diff_removed = resolve_hl('diffRemoved')
local bg = normal.bg or 0x1e1e2e
local add_bg = diff_add.bg or 0x2e4a3a
local del_bg = diff_delete.bg or 0x4a2e3a
local add_fg = diff_added.fg or diff_add.fg or 0x80c080
local del_fg = diff_removed.fg or diff_delete.fg or 0xc08080
local dark = vim.o.background ~= 'light'
local bg = normal.bg or (dark and 0x1a1a1a or 0xf0f0f0)
local add_bg = diff_add.bg or (dark and 0x1a3a1a or 0xd0ffd0)
local del_bg = diff_delete.bg or (dark and 0x3a1a1a or 0xffd0d0)
local add_fg = diff_added.fg or diff_add.fg or (dark and 0x80d080 or 0x206020)
local del_fg = diff_removed.fg or diff_delete.fg or (dark and 0xd08080 or 0x802020)
local blended_add = blend_color(add_bg, bg, 0.4)
local blended_del = blend_color(del_bg, bg, 0.4)
@ -483,7 +484,7 @@ local function compute_highlight_groups()
local blended_add_text = blend_color(add_fg, bg, alpha)
local blended_del_text = blend_color(del_fg, bg, alpha)
vim.api.nvim_set_hl(0, 'DiffsClear', { default = true, fg = normal.fg or 0xc0c0c0, bg = bg })
vim.api.nvim_set_hl(0, 'DiffsClear', { default = true, fg = normal.fg or (dark and 0xcccccc or 0x333333), bg = bg })
vim.api.nvim_set_hl(0, 'DiffsAdd', { default = true, bg = blended_add })
vim.api.nvim_set_hl(0, 'DiffsDelete', { default = true, bg = blended_del })
vim.api.nvim_set_hl(0, 'DiffsAddNr', { default = true, fg = blended_add_text, bg = blended_add })